Plastic drive gear from motor broken

Something must be broken if the motor is turning and the planetary is not. It will be one of the following, we will start from the first point of contact with the armature
1) Worm gear broken (fuse gear) you say no teeth broken
2) Worm gear not broken but whole unbroken plastic part not gripping aluminium boss
3) Pin through worm gear broken or missing
4) Pin through centre (or bevel) gear broken or missing
5) Pin through small gear in planetary broken or missing
6) Pin through planetary hub centre shaft broken or missing

The most common ones in order of likelihood are, 1, 2, 3 and 6

Start your investigation by removing the bottom plate. There should be a belt or chain going around 3 gears. Mine has 2 metal and one plastic. The 2 metal ones are on the ends of the rods that the ram runs up and down on. The plastic one is on top of a big speed reduction gear that is turned by the motor gear. Don't pinch your fingers but see if you can turn the big gear by hand. All gears should turn. If not check each gear for broken teeth, or bad bearing & races under the 2 rod gears.
Be sure to check the threaded hard plastic nut that drives the screw that powers the scissors up and down. This is the part that usually fails.

look for loose or missing starter bolts,the starter drive pinion gear either worn or damaged or flywheel gear teeth worn or broken. noise you hear if it sound like starter grinding noise check starter mounting bolts could be loosen or 1 missing or drive pinion gear or flywheel gear teeth worn or broken.

I would be inclined to replace the broken/worn gear and only any other bearings/bushes that show wear, which is probably none. I would remove any contaminated grease (it usually remains close to the failure point) and add more grease if necessary. The gear is a fuse gear and designed weaker to fail if the machine is overloaded so the gear that runs on it is unlikely to be damaged.

Look carefully at each of the gears. Take them apart and I bet some of the teeth are sheared off. Order new gearboxes should fix the problem. This happened to us.

What brand is it ? Shredder tech ( colorado) write back.

For parts availability and prices give Royal a call at 1-800-524-0799.

I suggest using Belzona (metal compound). Mix it with its hardner, paste it over the broken gear (dont worry if it gets over a couple of other gears. Let Belzona sink and dry (4-5hours). Get a Dremel drill with a fine blade on it and cut accurately where the teeth are meant to be. Voila, you have fixed your gear.

I turned the gear arround and put it on backwards
doitdel
I still need a new gear since it is still missing a couple of teeth

must disassemble feeder unit and visual check for jam. The debris may be a part of the shredder that has broken off.